The teen was walking across Avenue J to get onto a bus that had stopped at a pickup spot when he was struck by a 2014 Kia Forte at just east of 140th Street East (map), according to California Highway Patrol Officer Jeremy Picker.

The boy, identified by the Los Angeles County coroner’s office as Gage Rossi, sustained fatal injuries during the 6:01 a.m. crash.

His mother, Laura Hafner, told her son to “have a good day” as he walked out the door Friday morning.

Minutes later, Hafner said there was a knock on her door. “He said your son was hit, hit by a car,” Laura Hafner said.

She found Gage lying in the street. “I didn’t move him, because I know you’re not supposed to do that,” she said choking back tears. “I took off my own jacket and put it on him, because I know you’re supposed to keep them warm.”

She said it took 20 to 25 minutes for the ambulance to reach the remote neighborhood. “He wasn’t breathing, nothing,” she said. “And that was it.”